A) a strip of cartilage that forms a back and tail in all vertebrates.
B) a stiff dorsal supporting rod.
C) replaced by the vertebral column during development.
D) All of the choices are correct.
E) A stiff dorsal supporting rod that is replaced by the vertebral column during development.
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A) lizards
B) snakes
C) turtles
D) crocodiles
E) lizards and crocodiles have independent lineages
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A) lack bony skeletons.
B) have placoid scales.
C) have a keen sense of smell.
D) have teeth derived from epidermal scales.
E) All of the choices are correct.
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A) darters.
B) sharks.
C) bass and bluegill.
D) sturgeon and catfish.
E) lobe-finned fishes with lungs.
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A) Gnathostomes
B) Endothermic
C) Tetrapods
D) Amniotes
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A) leathery outer covering and an excurrent siphon
B) gill slits and bilateral symmetry
C) sexual reproduction and complete digestive system
D) sessile adult stage and aquatic lifestyle
E) leathery outer covering and sessile adult stage
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A) using spermatophores.
B) externally in water.
C) internally by copulation.
D) just like frogs.
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A) bony skeletons and lungs
B) paired fins and a bony skeleton
C) jaws and lungs
D) vertebrae and amniotic eggs
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A) are egg laying mammals.
B) include the anteater and duck-billed platypus.
C) nurse their young.
D) All of the above are true.
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